EP3667193B1 - Air conditioner - Google Patents
Air conditioner Download PDFInfo
- Publication number
- EP3667193B1 EP3667193B1 EP18868456.7A EP18868456A EP3667193B1 EP 3667193 B1 EP3667193 B1 EP 3667193B1 EP 18868456 A EP18868456 A EP 18868456A EP 3667193 B1 EP3667193 B1 EP 3667193B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- sub
- airflow
- blowing port
- air conditioner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007664 blowing Methods 0.000 claims description 67
- 238000010168 coupling process Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 239000003507 refrigerant Substances 0.000 description 10
- 238000001816 cooling Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 230000001939 inductive effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005206 flow analysis Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008451 emotion Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0011—Indoor units, e.g. fan coil units characterised by air outlets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/79—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling the direction of the supplied air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1413—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre using more than one tilting member, e.g. with several pivoting blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1486—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by bearings, pivots or hinges
Definitions
- the present disclosure relates to an air conditioner including an airflow guide unit for guiding airflow blown through a blowing port.
- an air conditioner is a device that removes dust in air while controlling temperature, humidity, airflow, and distribution suitable for human activity using a refrigeration cycle.
- the refrigeration cycle is composed of a compressor, a condenser, an evaporator, a blowing fan, and the like as main components.
- the air conditioner may be classified into a separate type air conditioner in which an indoor unit and an outdoor unit are separately installed, and an integrated air conditioner in which the indoor unit and the outdoor unit are installed together in one cabinet.
- the indoor unit of the separate type air conditioner includes a heat exchanger for heat-exchanging air sucked into a panel, a blowing fan for sucking air in a room into the panel and blowing the sucked air back into the room, and a blowing port for discharging airflow generated by the blowing fan.
- the airflow blown through the blowing port allows the room to be cooled or heated.
- the direction and speed of the airflow not only affect the speed of temperature change in indoor regions and the temperature difference in the indoor regions, but also affect a user's emotion through the airflow.
- EP1707893A1 and JP2007-132578A disclose air conditioners including multiple blades.
- EP1707893A1 discloses the features of the preamble of claim 1.
- the present disclosure is directed to providing an air conditioner capable of inducing airflow blown through a blowing port to be close to a horizontal direction.
- the present disclosure is directed to providing an air conditioner capable of minimizing frictional flow losses in inducing a direction of airflow blown through the blowing port.
- the present disclosure is directed to providing an air conditioner capable of variously setting direction and velocity of airflow blown through the blowing port.
- the first sub blade may have a longer horizontal length than the second sub blade.
- the first sub blade may be disposed to be inclined upward toward the front, and the second sub blade may be disposed to be inclined downward toward the front.
- the first sub blade may be disposed to be inclined 15 to 20 degrees with respect to a horizontal direction.
- the second sub blade may be disposed to be inclined 7 to 12 degrees with respect to a horizontal direction.
- the sub blade may be formed in a range of a center angle of 100 to 120 degrees about the rotation shaft.
- the sub blade may be formed to have a vertical thickness of 11 to 21 mm.
- the main blade may include a plurality of fine discharge ports to allow airflow to be discharged in a state of covering the blowing port.
- the main blade may include a first main blade disposed in the front of the blowing port in a state of opening the blowing port, and a second main blade disposed in the rear of the first main blade.
- the main blade and the sub blade may be detachably coupled.
- An exemplary aspect of the present disclosure provides an air conditioner including a housing including a blowing port, and a pair of blades disposed in the blowing port to have different inclination angles with respect to a horizontal direction in order to guide airflow blown through the blowing port toward the horizontal direction in a state in which an outer surface thereof is in contact with the airflow in the blowing port as a whole.
- the blades may include a first blade disposed to be inclined upward toward the front, and a second blade disposed to be inclined downward toward the front.
- the first blade may be disposed in the front of the second blade.
- the first blade may have a longer horizontal length than the second blade.
- the first blade may be disposed to be inclined 16 to 18 degrees with respect to the horizontal direction
- the second blade may be disposed to be inclined 9 to 11 degrees with respect to the horizontal direction.
- an air conditioner including a housing forming an appearance, a blowing port provided at a lower portion of the housing, a suction port provided at an upper portion of the housing, a first blade disposed to be inclined upward toward the front, and a second blade disposed to be spaced apart from the rear of the first blade and to be inclined downward toward the front.
- the first blade may have a longer horizontal length than the second blade.
- the first blade and the second blade may be configured to have a cross section of an airfoil shape.
- the first blade and the second blade may be configured to have a curved cross-sectional shape convex downward.
- airflow can be blown close to a horizontal direction through a blowing port, cold air does not reach a user directly so that the discomfort that the user may feel due to the cold air can be minimized, and blowing distance of airflow can increase so that the room temperature can quickly reach to a desired heating and cooling temperature.
- first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another.
- first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
- second component may also be referred to as a first component.
- the term "and/or" includes any combination of a plurality of related items or any one of a plurality of related items.
- front end In this specification, the terms “front end,” “rear end,” “upper portion,” “lower portion,” “upper end” and “lower end” used in the following description are defined with reference to the drawings, and the shape and position of each component are not limited by these terms.
- a refrigeration cycle of an air conditioner is composed of a compressor, a condenser, an expansion valve, and an evaporator.
- a refrigerant undergoes a series of processes consisting of compression, condensation, expansion, and evaporation, and a high temperature air is exchanged with a low temperature refrigerant to become a low temperature air and supplied to a room.
- the compressor compresses and discharges a refrigerant gas at high temperature and high pressure, and the discharged refrigerant gas is introduced into the condenser.
- the condenser condenses the compressed refrigerant into a liquid phase and releases heat to surroundings through the condensation process.
- the expansion valve expands a high temperature and high pressure liquid refrigerant condensed in the condenser into a low pressure liquid refrigerant.
- the evaporator evaporates the refrigerant expanded in the expansion valve.
- the evaporator uses the latent heat of evaporation of a refrigerant to achieve a cooling effect by heat exchange with an object to be cooled, and returns a low temperature and low pressure refrigerant gas to the compressor. Through this cycle, an air temperature of an indoor space may be controlled.
- An outdoor unit of the air conditioner refers to a device consisting of a compressor and an outdoor heat exchanger in a refrigeration cycle.
- An expansion valve may be disposed in either an indoor unit or an outdoor unit of an air conditioner, and an indoor heat exchanger is disposed in the indoor unit.
- the present disclosure relates to an air conditioner cooling an indoor space, and the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator.
- an indoor unit including an indoor heat exchanger is referred to as an air conditioner, and the indoor heat exchanger is referred to as a heat exchanger.
- FIG. 1 is a perspective view illustrating an appearance of an air conditioner according to an embodiment of the present disclosure.
- FIG. 2 is a cross-sectional view illustrating a state in which an airflow guide unit of the air conditioner according to an embodiment of the present disclosure covers a blowing port.
- FIG. 3 is a cross-sectional view illustrating a state in which airflow is guided forward by the airflow guide unit of the air conditioner according to an embodiment of the present disclosure.
- FIGS. 4 and 5 illustrate structural features of the airflow guide unit of the air conditioner according to an embodiment of the present disclosure.
- an air conditioner 1 may include a housing 10 having a suction port 13 and a blowing port 14, a heat exchanger 20 disposed inside the housing 10 to exchange heat with air introduced into the housing 10, and a blowing fan 31 sucking air into the housing 10 and flowing the sucked air toward the blowing port 14.
- the housing 10 may include a housing body 11 having a substantially rectangular parallelepiped shape, a front panel 16 forming a front surface of the housing 10, and a lower cover 12 capable of being opened downward.
- the suction port 13 may be provided at an upper portion of the housing 10, and the blowing port 14 may be provided at a lower portion of the housing 10.
- the air conditioner 1 may configured to be fixed to a wall surface.
- the housing body 11 may be fixed to a wall surface.
- the front panel 16 may be provided with a fine discharge port 16a to allow air to be discharged at a very low speed. Because the fine discharge port 16a is formed of holes of very small size so that airflow transferred to the front panel 16 from the inside of the housing 10 has a very low flow velocity in the process of passing through the fine discharge port 16a, the airflow discharged through the front panel 16 may not be recognized by a user.
- the lower cover 12 is configured to be opened and closed downward even after the housing body 11 is fixed to the wall surface, so that a pipe or a power line may be easily connected in the installation of the air conditioner 1.
- the blowing fan 31 may be a cross flow fan such as a sirocco fan, a blowing passage 17 may be provided below the blowing fan 31 to guide air discharged from the blowing fan 31, and air passed through the blowing passage 17 may be discharged to the outside through the blowing port 14.
- the blowing passage 17 may be provided with a louver 18 for guiding the switching of the discharged airflow in the left and right directions.
- the airflow guide unit 100 disposed in the blowing port 14 to guide airflow to be discharged.
- the airflow guide unit 100 is rotatably installed about a rotation shaft 101.
- the airflow guide unit 100 may be rotatably supported as the rotation shaft 101 is coupled to the support 19 and may be configured to be driven by a motor (not shown) to enable forward and reverse rotations in clockwise and counterclockwise directions.
- the airflow guide unit 100 includes a main blade 110 configured to cover the blowing port 14, and a sub blade 120 configured to guide airflow to a horizontal direction through the blowing port 14 in a state in which the airflow guide unit 100 opens the blowing port 14.
- the main blade 110 may be provided with a fine discharge port 111 as in the front panel 16. Accordingly, even when the main blade 110 covers the blowing port 14, airflow may be discharged at a very low speed through the fine discharge port 16a of the front panel 16 and the fine discharge port 110a of the main blade 110.
- the airflow guide unit 100 may be arranged to open the blowing port 14 by rotating in the clockwise direction.
- the main blade 110 may be disposed to direct the front.
- the main blade 110 may include a first main blade 111 disposed in the front of the blowing port and a second main blade 112 disposed in the rear of the first main blade 111.
- the first main blade 111 may be disposed to be slightly inclined upward with respect to a horizontal plane so that the airflow passed through the blowing port 14 may be induced to direct the front.
- the second main blade 112 may be arranged to form an upper portion of the blowing port 14 so that the airflow may be guided to direct the front.
- the first main blade 111 and the second main blade 112 may be disposed to be spaced apart from each other in the horizontal direction, and a flow passage 113 through which airflow may pass may be formed between the first main blade 111 and the second main blade 112.
- the airflow guide unit 100 further includes the sub blade 120 disposed to be spaced downwardly from the main blade 110.
- the sub blade 120 includes a pair of a first sub blade 121 and a second sub blade 122 disposed to be spaced apart from each other.
- the second sub blade 122 is disposed in the rear of the first sub blade 121 in a state in which the main blade 110 opens the blowing port 14
- the first sub blade 121 and the second sub blade 122 may be disposed to have different inclination angles with respect to the horizontal direction. Specifically, the first sub blade 121 may be disposed to be slightly inclined upward toward the front, and the second sub blade 122 may be disposed to be slightly inclined downward toward the front.
- first sub blade 121 may be disposed to be inclined within an angle range of 15 to 20 degrees with respect to the horizontal plane
- second sub blade 122 may be disposed to be inclined within an angle range of 7 to 12 degrees with respect to the horizontal plane.
- the first sub blade 121 may be disposed to be inclined at about 17 degrees with respect to the horizontal plane, and the second sub blade 122 may be disposed to be inclined at about 10 degrees with respect to the horizontal plane.
- the first sub blade 121 and the second sub blade 122 are disposed to be spaced apart from each other in the horizontal direction, and a flow passage 123 through which airflow may pass may be formed between the second sub blade 121 and the second sub blade 122.
- the sub blade 120 may have an appropriate size and structural shape to induce the movement of airflow in the horizontal direction.
- the first sub blade 121 may be provided to have a horizontal length L1 longer than a horizontal length L2 of the second sub blade 122.
- the sub blade 120 may be formed in a range of a center angle ⁇ of 100 to 120 degrees about the rotation shaft 41 of the airflow guide unit 40 as a whole, and thus may be provided to have a horizontal length corresponding to the center angle ⁇ .
- the sub blade 120 may be formed in a range of the center angle ⁇ of 110 degrees about the rotation shaft 41 of the airflow guide unit 40, and thus may have a horizontal length corresponding to the center angle ⁇ .
- the sub blade 120 may be formed to have a vertical thickness D of 11 to 21mm.
- the sub blade 120 may be formed to have the vertical thickness D of 16mm.
- the sub blade 120 may be formed in a range of the center angle ⁇ of 100 to 120 degrees about the rotation shaft 41 of the airflow guide unit 40.
- the sub blade 120 may be formed in a range of the center angle ⁇ of 110 degrees about the rotation shaft 41 of the airflow guide unit 40.
- first sub blade 121 and the second sub blade 122 may be provided to have a cross section of an airfoil shape as a whole, and may be disposed to be in contact with airflow in the blowing port. Therefore, the first sub blade 121 and the second sub blade 122 may guide the airflow through the entire outer surface including upper and lower surfaces.
- first sub blade 121 and the second sub blade 122 may be provided to have a curved cross-sectional shape convex downward.
- FIG. 6 is an exploded perspective view of the airflow guide unit according to an embodiment of the present disclosure
- FIG. 7 is an enlarged view of coupling portions of a main blade and a sub blade in FIG. 6 .
- the airflow guide unit 40 may be configured by including a main blade 110 and a sub blade 120 as described above. According to the invention, the main blade 110 and the pair of sub blades 120 are integrally configured through coupling Preferably, the main blade 110 and the pair of sub-blades 120 are detachably coupled.
- a locking hook 125 protruding upward may be provided on an upper portion of opposite side surfaces 124 of the sub blade 120 for coupling the main blade 110 and the sub blade 120, and a corresponding locking groove 115 may be provided at opposite ends of the second main blade 112 of the main blade 110.
- the main blade 110 and the sub blade 120 may be coupled by a coupling force between the locking hook 125 and the locking groove 115 as the locking hook is inserted into the locking groove. Because coupling by the locking hook 125 and the locking groove 115 may be released by detaching the locking hook 125 from the locking groove 115, the main blade 110 and the sub blade 120 may be detachably coupled.
- an adhering portion between the main blade 110 and the sub blade 120 may be adhered by an adhesive or may be adhered by heating and fusion by ultrasonic waves and the like.
- FIG. 8 is a view illustrating a flow analysis result around the airflow guide unit in a state in which airflow is induced by the airflow guide unit according to an embodiment of the present disclosure.
- airflow flows quickly along a periphery of the sub blade 120 by the Coanda effect without the occurrence of flow separation around the sub blade 120. Therefore, the airflow may be induced upward while minimizing the airflow loss before and after the passage of the sub blade 120, and this may increase blowing distance of the airflow and reduce blowing noise.
- the airflow guide unit 100 In the case of inducing airflow to change a direction of the airflow by colliding a surface of the blade with the airflow, flow separation occurs along the surface of the blade, which increases the flow resistance, thereby increasing the airflow loss and blowing noise.
- the airflow guide unit 100 because the first main blade 111 and the sub blade 120 having an airfoil-shaped cross section is disposed on the flow passage of the blowing port 14 so that the airflow may be induced upward while the flow separation is suppressed to the maximum by a shape difference between the upper and lower surfaces in a state where the outer surface thereof is in contact with the airflow as a whole, the blowing distance of the airflow may increase and the blowing noise may be reduced, compared to the case of inducing airflow to change a direction of the airflow by colliding a surface of the blade with the airflow.
- FIG. 9 is a view illustrating a state in which airflow is induced downward by the airflow guide unit according to an embodiment of the present disclosure.
- the air conditioner 1 may be a combined type of cooling and heating capable of performing both a cooling operation and a heating operation.
- the structure and method of inducing airflow upward through the airflow guide unit 100 in the cooling operation are the same as the above-described embodiment.
- the airflow guide unit 100 when the airflow guide unit 100 is slightly rotated counterclockwise from a cooling operation position in the heating operation, airflow may be induced downward by the main blade 110 and the sub blade 120. Therefore, according to an embodiment of the present disclosure, the airflow guide unit 100 may be applied to the heating operation. In addition, because airflow is induced along the outer surfaces of the main blade 110 and the sub blade 120 even in the heating operation, the blowing distance of the airflow may increase and the blowing noise may be reduced.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
Description
- The present disclosure relates to an air conditioner including an airflow guide unit for guiding airflow blown through a blowing port.
- In general, an air conditioner is a device that removes dust in air while controlling temperature, humidity, airflow, and distribution suitable for human activity using a refrigeration cycle. The refrigeration cycle is composed of a compressor, a condenser, an evaporator, a blowing fan, and the like as main components.
- The air conditioner may be classified into a separate type air conditioner in which an indoor unit and an outdoor unit are separately installed, and an integrated air conditioner in which the indoor unit and the outdoor unit are installed together in one cabinet. The indoor unit of the separate type air conditioner includes a heat exchanger for heat-exchanging air sucked into a panel, a blowing fan for sucking air in a room into the panel and blowing the sucked air back into the room, and a blowing port for discharging airflow generated by the blowing fan.
- The airflow blown through the blowing port allows the room to be cooled or heated. At this time, the direction and speed of the airflow not only affect the speed of temperature change in indoor regions and the temperature difference in the indoor regions, but also affect a user's emotion through the airflow.
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EP1707893A1 andJP2007-132578A EP1707893A1 discloses the features of the preamble ofclaim 1. - The present disclosure is directed to providing an air conditioner capable of inducing airflow blown through a blowing port to be close to a horizontal direction.
- The present disclosure is directed to providing an air conditioner capable of minimizing frictional flow losses in inducing a direction of airflow blown through the blowing port.
- The present disclosure is directed to providing an air conditioner capable of variously setting direction and velocity of airflow blown through the blowing port.
- In accordance with the present invention, there is provided an air conditioner according to
claim 1. Optional features are set out in the dependent claims. - The first sub blade may have a longer horizontal length than the second sub blade.
- The first sub blade may be disposed to be inclined upward toward the front, and the second sub blade may be disposed to be inclined downward toward the front.
- The first sub blade may be disposed to be inclined 15 to 20 degrees with respect to a horizontal direction.
- The second sub blade may be disposed to be inclined 7 to 12 degrees with respect to a horizontal direction.
- The sub blade may be formed in a range of a center angle of 100 to 120 degrees about the rotation shaft.
- The sub blade may be formed to have a vertical thickness of 11 to 21 mm.
- The main blade may include a plurality of fine discharge ports to allow airflow to be discharged in a state of covering the blowing port.
- The main blade may include a first main blade disposed in the front of the blowing port in a state of opening the blowing port, and a second main blade disposed in the rear of the first main blade.
- The main blade and the sub blade may be detachably coupled.
- An exemplary aspect of the present disclosure provides an air conditioner including a housing including a blowing port, and a pair of blades disposed in the blowing port to have different inclination angles with respect to a horizontal direction in order to guide airflow blown through the blowing port toward the horizontal direction in a state in which an outer surface thereof is in contact with the airflow in the blowing port as a whole.
- The blades may include a first blade disposed to be inclined upward toward the front, and a second blade disposed to be inclined downward toward the front.
- The first blade may be disposed in the front of the second blade.
- The first blade may have a longer horizontal length than the second blade.
- The first blade may be disposed to be inclined 16 to 18 degrees with respect to the horizontal direction, and the second blade may be disposed to be inclined 9 to 11 degrees with respect to the horizontal direction.
- Another exemplary aspect of the present disclosure provides an air conditioner including a housing forming an appearance, a blowing port provided at a lower portion of the housing, a suction port provided at an upper portion of the housing, a first blade disposed to be inclined upward toward the front, and a second blade disposed to be spaced apart from the rear of the first blade and to be inclined downward toward the front.
- The first blade may have a longer horizontal length than the second blade.
- The first blade and the second blade may be configured to have a cross section of an airfoil shape.
- The first blade and the second blade may be configured to have a curved cross-sectional shape convex downward.
- Because airflow can be blown close to a horizontal direction through a blowing port, cold air does not reach a user directly so that the discomfort that the user may feel due to the cold air can be minimized, and blowing distance of airflow can increase so that the room temperature can quickly reach to a desired heating and cooling temperature.
-
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FIG. 1 is a perspective view illustrating an appearance of an air conditioner according to an embodiment of the present disclosure. -
FIG. 2 is a cross-sectional view illustrating a state in which an airflow guide unit of the air conditioner according to an embodiment of the present disclosure covers a blowing port. -
FIG. 3 is a cross-sectional view illustrating a state in which airflow is guided forward by the airflow guide unit of the air conditioner according to an embodiment of the present disclosure. -
FIGS. 4 and5 illustrate structural features of the airflow guide unit of the air conditioner according to an embodiment of the present disclosure. -
FIG. 6 is an exploded perspective view of the airflow guide unit according to an embodiment of the present disclosure. -
FIG. 7 is an enlarged view of coupling portions of a main blade and a sub blade inFIG. 6 . -
FIG. 8 is a view illustrating a flow analysis result around the airflow guide unit in a state in which airflow is induced by the airflow guide unit according to an embodiment of the present disclosure. -
FIG. 9 is a view illustrating a state in which airflow is induced downward by the airflow guide unit according to an embodiment of the present disclosure. - The embodiments described in the present specification and the configurations shown in the drawings are only examples of preferred embodiments of the present disclosure, and various modifications may be made at the time of filing of the present disclosure to replace the embodiments and drawings of the present specification.
- Like reference numbers or signs in the various drawings of the application represent parts or components that perform substantially the same functions.
- The terms used herein are for the purpose of describing the embodiments and are not intended to restrict and/or to limit the present disclosure. For example, the singular expressions herein may include plural expressions, unless the context clearly dictates otherwise. Also, the terms "comprises" and "has" are intended to indicate that there are features, numbers, steps, operations, elements, parts, or combinations thereof described in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts, or combinations thereof.
- It will be understood that, although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. For example, without departing from the scope of the present disclosure, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and/or" includes any combination of a plurality of related items or any one of a plurality of related items.
- In this specification, the terms "front end," "rear end," "upper portion," "lower portion," "upper end" and "lower end" used in the following description are defined with reference to the drawings, and the shape and position of each component are not limited by these terms.
- Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
- A refrigeration cycle of an air conditioner is composed of a compressor, a condenser, an expansion valve, and an evaporator. A refrigerant undergoes a series of processes consisting of compression, condensation, expansion, and evaporation, and a high temperature air is exchanged with a low temperature refrigerant to become a low temperature air and supplied to a room.
- The compressor compresses and discharges a refrigerant gas at high temperature and high pressure, and the discharged refrigerant gas is introduced into the condenser. The condenser condenses the compressed refrigerant into a liquid phase and releases heat to surroundings through the condensation process. The expansion valve expands a high temperature and high pressure liquid refrigerant condensed in the condenser into a low pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve. The evaporator uses the latent heat of evaporation of a refrigerant to achieve a cooling effect by heat exchange with an object to be cooled, and returns a low temperature and low pressure refrigerant gas to the compressor. Through this cycle, an air temperature of an indoor space may be controlled.
- An outdoor unit of the air conditioner refers to a device consisting of a compressor and an outdoor heat exchanger in a refrigeration cycle. An expansion valve may be disposed in either an indoor unit or an outdoor unit of an air conditioner, and an indoor heat exchanger is disposed in the indoor unit.
- The present disclosure relates to an air conditioner cooling an indoor space, and the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator. Hereinafter, for convenience, an indoor unit including an indoor heat exchanger is referred to as an air conditioner, and the indoor heat exchanger is referred to as a heat exchanger.
-
FIG. 1 is a perspective view illustrating an appearance of an air conditioner according to an embodiment of the present disclosure.FIG. 2 is a cross-sectional view illustrating a state in which an airflow guide unit of the air conditioner according to an embodiment of the present disclosure covers a blowing port.FIG. 3 is a cross-sectional view illustrating a state in which airflow is guided forward by the airflow guide unit of the air conditioner according to an embodiment of the present disclosure.FIGS. 4 and5 illustrate structural features of the airflow guide unit of the air conditioner according to an embodiment of the present disclosure. - As illustrated in
FIGS. 1 to 5 , anair conditioner 1 may include ahousing 10 having asuction port 13 and a blowingport 14, aheat exchanger 20 disposed inside thehousing 10 to exchange heat with air introduced into thehousing 10, and a blowingfan 31 sucking air into thehousing 10 and flowing the sucked air toward the blowingport 14. - The
housing 10 may include ahousing body 11 having a substantially rectangular parallelepiped shape, afront panel 16 forming a front surface of thehousing 10, and alower cover 12 capable of being opened downward. - The
suction port 13 may be provided at an upper portion of thehousing 10, and the blowingport 14 may be provided at a lower portion of thehousing 10. - The
air conditioner 1 may configured to be fixed to a wall surface. Specifically, thehousing body 11 may be fixed to a wall surface. - The
front panel 16 may be provided with afine discharge port 16a to allow air to be discharged at a very low speed. Because thefine discharge port 16a is formed of holes of very small size so that airflow transferred to thefront panel 16 from the inside of thehousing 10 has a very low flow velocity in the process of passing through thefine discharge port 16a, the airflow discharged through thefront panel 16 may not be recognized by a user. - The
lower cover 12 is configured to be opened and closed downward even after thehousing body 11 is fixed to the wall surface, so that a pipe or a power line may be easily connected in the installation of theair conditioner 1. - The blowing
fan 31 may be a cross flow fan such as a sirocco fan, ablowing passage 17 may be provided below the blowingfan 31 to guide air discharged from the blowingfan 31, and air passed through the blowingpassage 17 may be discharged to the outside through the blowingport 14. - The blowing
passage 17 may be provided with alouver 18 for guiding the switching of the discharged airflow in the left and right directions. - According to the invention, the
airflow guide unit 100 disposed in the blowingport 14 to guide airflow to be discharged. Theairflow guide unit 100 is rotatably installed about arotation shaft 101. - The
airflow guide unit 100 may be rotatably supported as therotation shaft 101 is coupled to thesupport 19 and may be configured to be driven by a motor (not shown) to enable forward and reverse rotations in clockwise and counterclockwise directions. - As illustrated in
FIG. 2 , theairflow guide unit 100 includes amain blade 110 configured to cover the blowingport 14, and asub blade 120 configured to guide airflow to a horizontal direction through the blowingport 14 in a state in which theairflow guide unit 100 opens the blowingport 14. - The
main blade 110 may be provided with afine discharge port 111 as in thefront panel 16. Accordingly, even when themain blade 110 covers the blowingport 14, airflow may be discharged at a very low speed through thefine discharge port 16a of thefront panel 16 and thefine discharge port 110a of themain blade 110. - When the discharge of airflow in the horizontal direction through the blowing
port 14 is required, as illustrated inFIG. 3 , theairflow guide unit 100 may be arranged to open the blowingport 14 by rotating in the clockwise direction. - As illustrated in
FIG. 3 , in a state in which theairflow guide unit 100 opens the blowingport 14, themain blade 110 may be disposed to direct the front. Themain blade 110 may include a firstmain blade 111 disposed in the front of the blowing port and a secondmain blade 112 disposed in the rear of the firstmain blade 111. - The first
main blade 111 may be disposed to be slightly inclined upward with respect to a horizontal plane so that the airflow passed through the blowingport 14 may be induced to direct the front. - The second
main blade 112 may be arranged to form an upper portion of the blowingport 14 so that the airflow may be guided to direct the front. - The first
main blade 111 and the secondmain blade 112 may be disposed to be spaced apart from each other in the horizontal direction, and aflow passage 113 through which airflow may pass may be formed between the firstmain blade 111 and the secondmain blade 112. - According to the invention, the
airflow guide unit 100 further includes thesub blade 120 disposed to be spaced downwardly from themain blade 110. - The
sub blade 120 includes a pair of afirst sub blade 121 and asecond sub blade 122 disposed to be spaced apart from each other. Thesecond sub blade 122 is disposed in the rear of thefirst sub blade 121 in a state in which themain blade 110 opens the blowingport 14 - The
first sub blade 121 and thesecond sub blade 122 may be disposed to have different inclination angles with respect to the horizontal direction. Specifically, thefirst sub blade 121 may be disposed to be slightly inclined upward toward the front, and thesecond sub blade 122 may be disposed to be slightly inclined downward toward the front. - More specifically, the
first sub blade 121 may be disposed to be inclined within an angle range of 15 to 20 degrees with respect to the horizontal plane, and thesecond sub blade 122 may be disposed to be inclined within an angle range of 7 to 12 degrees with respect to the horizontal plane. - According to an embodiment illustrated, the
first sub blade 121 may be disposed to be inclined at about 17 degrees with respect to the horizontal plane, and thesecond sub blade 122 may be disposed to be inclined at about 10 degrees with respect to the horizontal plane. - The
first sub blade 121 and thesecond sub blade 122 are disposed to be spaced apart from each other in the horizontal direction, and aflow passage 123 through which airflow may pass may be formed between thesecond sub blade 121 and thesecond sub blade 122. - The
sub blade 120 may have an appropriate size and structural shape to induce the movement of airflow in the horizontal direction. - According to an embodiment, the
first sub blade 121 may be provided to have a horizontal length L1 longer than a horizontal length L2 of thesecond sub blade 122. - According to an embodiment, the
sub blade 120 may be formed in a range of a center angle θ of 100 to 120 degrees about therotation shaft 41 of theairflow guide unit 40 as a whole, and thus may be provided to have a horizontal length corresponding to the center angle θ. - According to an embodiment, the
sub blade 120 may be formed in a range of the center angle θ of 110 degrees about therotation shaft 41 of theairflow guide unit 40, and thus may have a horizontal length corresponding to the center angle θ. - According to an embodiment, the
sub blade 120 may be formed to have a vertical thickness D of 11 to 21mm. - According to an embodiment, the
sub blade 120 may be formed to have the vertical thickness D of 16mm. - According to an embodiment, the
sub blade 120 may be formed in a range of the center angle θ of 100 to 120 degrees about therotation shaft 41 of theairflow guide unit 40. - According to an embodiment, the
sub blade 120 may be formed in a range of the center angle θ of 110 degrees about therotation shaft 41 of theairflow guide unit 40. - In addition, the
first sub blade 121 and thesecond sub blade 122 may be provided to have a cross section of an airfoil shape as a whole, and may be disposed to be in contact with airflow in the blowing port. Therefore, thefirst sub blade 121 and thesecond sub blade 122 may guide the airflow through the entire outer surface including upper and lower surfaces. - In addition, the
first sub blade 121 and thesecond sub blade 122 may be provided to have a curved cross-sectional shape convex downward. -
FIG. 6 is an exploded perspective view of the airflow guide unit according to an embodiment of the present disclosure, andFIG. 7 is an enlarged view of coupling portions of a main blade and a sub blade inFIG. 6 . - The
airflow guide unit 40 may be configured by including amain blade 110 and asub blade 120 as described above. According to the invention, themain blade 110 and the pair ofsub blades 120 are integrally configured through coupling Preferably, themain blade 110 and the pair ofsub-blades 120 are detachably coupled. - According to an embodiment, a
locking hook 125 protruding upward may be provided on an upper portion of opposite side surfaces 124 of thesub blade 120 for coupling themain blade 110 and thesub blade 120, and acorresponding locking groove 115 may be provided at opposite ends of the secondmain blade 112 of themain blade 110. - Therefore, the
main blade 110 and thesub blade 120 may be coupled by a coupling force between the lockinghook 125 and the lockinggroove 115 as the locking hook is inserted into the locking groove. Because coupling by the lockinghook 125 and the lockinggroove 115 may be released by detaching thelocking hook 125 from the lockinggroove 115, themain blade 110 and thesub blade 120 may be detachably coupled. - The coupling structure and coupling method between the
main blade 110 and thesub blade 120 as described above are just one example, and the present disclosure is not limited thereto. For example, an adhering portion between themain blade 110 and thesub blade 120 may be adhered by an adhesive or may be adhered by heating and fusion by ultrasonic waves and the like. -
FIG. 8 is a view illustrating a flow analysis result around the airflow guide unit in a state in which airflow is induced by the airflow guide unit according to an embodiment of the present disclosure. - According to an embodiment, it may be seen that airflow flows quickly along a periphery of the
sub blade 120 by the Coanda effect without the occurrence of flow separation around thesub blade 120. Therefore, the airflow may be induced upward while minimizing the airflow loss before and after the passage of thesub blade 120, and this may increase blowing distance of the airflow and reduce blowing noise. - In the case of inducing airflow to change a direction of the airflow by colliding a surface of the blade with the airflow, flow separation occurs along the surface of the blade, which increases the flow resistance, thereby increasing the airflow loss and blowing noise. However, according to the
airflow guide unit 100 according to an embodiment of the present disclosure, because the firstmain blade 111 and thesub blade 120 having an airfoil-shaped cross section is disposed on the flow passage of the blowingport 14 so that the airflow may be induced upward while the flow separation is suppressed to the maximum by a shape difference between the upper and lower surfaces in a state where the outer surface thereof is in contact with the airflow as a whole, the blowing distance of the airflow may increase and the blowing noise may be reduced, compared to the case of inducing airflow to change a direction of the airflow by colliding a surface of the blade with the airflow. -
FIG. 9 is a view illustrating a state in which airflow is induced downward by the airflow guide unit according to an embodiment of the present disclosure. - The
air conditioner 1 according to an embodiment of the present disclosure may be a combined type of cooling and heating capable of performing both a cooling operation and a heating operation. The structure and method of inducing airflow upward through theairflow guide unit 100 in the cooling operation are the same as the above-described embodiment. - In the heating operation, because the temperature of airflow is higher than that of the surrounding air and thus the discharged airflow tends to direct upward, it may be advantageous to induce the airflow downward than in the cooling operation.
- As illustrated in
FIG. 9 , when theairflow guide unit 100 is slightly rotated counterclockwise from a cooling operation position in the heating operation, airflow may be induced downward by themain blade 110 and thesub blade 120. Therefore, according to an embodiment of the present disclosure, theairflow guide unit 100 may be applied to the heating operation. In addition, because airflow is induced along the outer surfaces of themain blade 110 and thesub blade 120 even in the heating operation, the blowing distance of the airflow may increase and the blowing noise may be reduced. - While the present disclosure has been particularly described with reference to exemplary embodiments, it should be understood by those of skilled in the art that various changes in form and details may be made without departing from the scope of the present invention as defined by the appended claims.
Claims (10)
- An air conditioner comprising:a housing (10) comprising a blowing port (14); andan airflow guide unit (100) installed in the blowing port (14) configuredto be rotatable about a rotation shaft (101) so to provide a state of covering the blowing port (14) and a state of opening the blowing port (14) to guide the airflow to be discharged, the airflow guide unit (100) comprising a main blade (110) and sub-blades (120);characterised in that:the main blade (110) is configured to cover or open the blowing port (14); and the sub-blades isa pair of sub-blades (120) integrally configured through coupling with the main blade (110) wherein in a state in which the main blade (110) opens the blowing port (14), the pair of sub-blades (120) is spaced downwardly apart from the main blade (110), disposed in a flow passage (123) of the blowing port (14) such that outer surfaces thereof are in contact with airflow in the blowing port (14) as a whole, and having different inclination angles,the pair of sub-blades (120) comprises a first sub-blade (121) disposed in the blowing port (14) and a second sub-blade (122) disposed in the rear of the first sub-blade (121), andwherein the first sub-blade (121) and the second sub-blade (122) are spaced apart from each other in the horizontal direction and fixed to each other on each of the opposite side surfaces (124).
- The air conditioner according to claim 1, wherein the first sub-blade (121) has a longer horizontal length than the second sub-blade (122).
- The air conditioner according to claim 1, wherein in a state in which the main blade (110) opens the blowing port (14), the first sub-blade (121) is disposed to be inclined upward toward the front, and the second sub-blade (122) is disposed to be inclined downward toward the front.
- The air conditioner according to claim 3, wherein the first sub-blade (121) is disposed to be inclined 15 to 20 degrees with respect to a horizontal direction.
- The air conditioner according to claim 3, wherein the second sub-blade (122) is disposed to be inclined 7 to 12 degrees with respect to a horizontal direction.
- The air conditioner according to claim 3, wherein the pair of sub-blades (120) are formed in a range of a centre angle of 100 to 120 degrees about the rotation shaft (101).
- The air conditioner according to claim 3, wherein the pair of sub-blades (120) are formed to have a vertical thickness of 11 to 21 mm.
- The air conditioner according to claim 1, wherein the main blade (110) comprises a plurality of fine discharge ports (110a) to allow airflow to be discharged in a state of covering the blowing port (14).
- The air conditioner according to claim 1, wherein the main blade (110) comprises:a first main blade (111) disposed in the front of the blowing port (14), anda second main blade (112) disposed in the rear of the first main blade (111) in a state of opening the blowing port (14).
- The air conditioner according to claim 1, wherein the main blade (110) and the pair of sub-blades (120) are detachably coupled.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020170133855A KR102506415B1 (en) | 2017-10-16 | 2017-10-16 | Air conditioner |
PCT/KR2018/012139 WO2019078565A1 (en) | 2017-10-16 | 2018-10-15 | Air conditioner |
Publications (3)
Publication Number | Publication Date |
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EP3667193A1 EP3667193A1 (en) | 2020-06-17 |
EP3667193A4 EP3667193A4 (en) | 2020-08-26 |
EP3667193B1 true EP3667193B1 (en) | 2022-05-25 |
Family
ID=66174088
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18868456.7A Active EP3667193B1 (en) | 2017-10-16 | 2018-10-15 | Air conditioner |
Country Status (5)
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US (1) | US11448419B2 (en) |
EP (1) | EP3667193B1 (en) |
KR (1) | KR102506415B1 (en) |
CN (1) | CN111630323B (en) |
WO (1) | WO2019078565A1 (en) |
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KR102531649B1 (en) * | 2018-01-17 | 2023-05-11 | 삼성전자주식회사 | Air conditioner |
JP6926024B2 (en) * | 2018-03-30 | 2021-08-25 | ダイキン工業株式会社 | Indoor unit of air conditioner |
EP4001790B1 (en) * | 2019-09-17 | 2024-03-20 | Daikin Industries, Ltd. | Indoor unit for air conditioner |
CN110762822B (en) * | 2019-11-29 | 2023-10-31 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN111006381B (en) * | 2019-11-29 | 2023-09-26 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN111076396B (en) * | 2019-11-29 | 2023-09-12 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN111121261B (en) * | 2019-11-29 | 2023-09-12 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN111351200B (en) * | 2019-11-29 | 2023-09-26 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN111006382B (en) * | 2019-11-29 | 2023-10-31 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN110749078B (en) * | 2019-11-29 | 2023-09-26 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN111156680B (en) * | 2019-11-29 | 2023-09-12 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN110749079B (en) * | 2019-11-29 | 2023-09-08 | 广东美的制冷设备有限公司 | Air deflector assembly and air conditioner |
CN116018481A (en) * | 2020-08-11 | 2023-04-25 | 三星电子株式会社 | Suspended ceiling type air conditioner |
CN112082259A (en) * | 2020-08-31 | 2020-12-15 | 珠海格力电器股份有限公司 | Air conditioner casing and air conditioner |
KR20220090892A (en) * | 2020-12-23 | 2022-06-30 | 삼성전자주식회사 | Air conditioner |
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JP3439069B2 (en) * | 1997-05-30 | 2003-08-25 | 三洋電機株式会社 | Air conditioner |
JP2001304674A (en) * | 2000-04-20 | 2001-10-31 | Fujitsu General Ltd | Indoor unit of air conditioner |
JP3624808B2 (en) * | 2000-08-11 | 2005-03-02 | ダイキン工業株式会社 | Air conditioner decorative panel, air outlet unit, and air conditioner |
CN1203282C (en) * | 2001-01-26 | 2005-05-25 | 松下电器产业株式会社 | Air flow direction changer for air conditioner |
JP4110863B2 (en) * | 2002-07-12 | 2008-07-02 | 株式会社富士通ゼネラル | Air conditioner |
JP3792226B2 (en) | 2003-11-28 | 2006-07-05 | シャープ株式会社 | Air conditioner |
EP1707893B1 (en) * | 2003-11-28 | 2017-05-10 | Sharp Kabushiki Kaisha | Air conditioner |
JP4641249B2 (en) | 2005-11-09 | 2011-03-02 | 東芝キヤリア株式会社 | Air conditioner indoor unit |
JP4430649B2 (en) * | 2006-10-20 | 2010-03-10 | 三星電子株式会社 | Indoor unit of air conditioner |
KR101085903B1 (en) | 2006-11-09 | 2011-11-23 | 삼성전자주식회사 | A Ceiling type air conditioner |
KR20080055454A (en) * | 2006-12-15 | 2008-06-19 | 엘지전자 주식회사 | Air conditioner |
JP5103119B2 (en) * | 2007-09-27 | 2012-12-19 | 三洋電機株式会社 | Air conditioner |
EP2327938A4 (en) * | 2008-08-22 | 2015-07-01 | Toshiba Carrier Corp | Indoor machine of air conditioner |
JP4965618B2 (en) * | 2009-09-15 | 2012-07-04 | シャープ株式会社 | Air direction change device for air conditioner |
JP2014016132A (en) * | 2012-07-11 | 2014-01-30 | Panasonic Corp | Air conditioner |
EP3124887B1 (en) * | 2014-03-28 | 2018-11-21 | Mitsubishi Electric Corporation | Air conditioner |
CN105180267B (en) * | 2015-08-07 | 2018-02-06 | 广东美的制冷设备有限公司 | Air-out control method in indoor apparatus of air conditioner and air conditioning chamber |
CN206073390U (en) | 2016-09-09 | 2017-04-05 | 珠海格力电器股份有限公司 | Wind deflector and air-conditioner |
-
2017
- 2017-10-16 KR KR1020170133855A patent/KR102506415B1/en active IP Right Grant
-
2018
- 2018-10-15 CN CN201880067282.3A patent/CN111630323B/en active Active
- 2018-10-15 WO PCT/KR2018/012139 patent/WO2019078565A1/en unknown
- 2018-10-15 US US16/756,728 patent/US11448419B2/en active Active
- 2018-10-15 EP EP18868456.7A patent/EP3667193B1/en active Active
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US11448419B2 (en) | 2022-09-20 |
US20210190370A1 (en) | 2021-06-24 |
CN111630323B (en) | 2021-12-31 |
WO2019078565A1 (en) | 2019-04-25 |
EP3667193A4 (en) | 2020-08-26 |
EP3667193A1 (en) | 2020-06-17 |
KR20190042201A (en) | 2019-04-24 |
KR102506415B1 (en) | 2023-03-07 |
CN111630323A (en) | 2020-09-04 |
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